When Himuro finds out that her junior in the Ikeda lab, Kosuke, has spent over 220 thousand yen on his beloved Aika and holds her every night when he goes to sleep, she is shaken by the realization that the only present she's ever given Yukimura is a notebook, and that she's never held him while she slept. She worries that she can't objectively call what she feels "love." As Yukimura and Himuro endlessly debate "love" using numbers, Kanade proposes that the two of them go on a date, but...
...pretty much only the 728 yen 
notebook I gave him last year.
حوالي 728 ين وهو ثمن دفتر أهديته... 
إيّاه العام الماضي
Die 728 Yen für das Notizheft
letztes Jahr.
… un carnet à 720 yens
pour son dernier anniversaire !
...praticamente solo i 728 yen
del taccuino che gli ho regalato l'anno scorso.
...728 ienes num bloquinho que
dei pra ele ano passado.